// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//

package config

import (
	"bytes"
	"path"
	"text/template"

	"github.com/kumose/kmopt/embed"
	"github.com/kumose/kmopt/pkg/utils"
)

// BlackboxConfig represent the data to generate AlertManager config
type BlackboxConfig struct {
	DeployDir  string
	TLSEnabled bool
}

// NewBlackboxConfig returns a BlackboxConfig
func NewBlackboxConfig(deployDir string, tlsEnabled bool) *BlackboxConfig {
	return &BlackboxConfig{
		DeployDir:  deployDir,
		TLSEnabled: tlsEnabled,
	}
}

// Config generate the config file data.
func (c *BlackboxConfig) Config() ([]byte, error) {
	fp := path.Join("templates", "config", "blackbox.yml.tpl")
	tpl, err := embed.ReadTemplate(fp)
	if err != nil {
		return nil, err
	}
	return c.ConfigWithTemplate(string(tpl))
}

// ConfigToFile write config content to specific path
func (c *BlackboxConfig) ConfigToFile(file string) error {
	config, err := c.Config()
	if err != nil {
		return err
	}
	return utils.WriteFile(file, config, 0755)
}

// ConfigWithTemplate generate the AlertManager config content by tpl
func (c *BlackboxConfig) ConfigWithTemplate(tpl string) ([]byte, error) {
	tmpl, err := template.New("Blackbox").Parse(tpl)
	if err != nil {
		return nil, err
	}

	content := bytes.NewBufferString("")
	if err := tmpl.Execute(content, c); err != nil {
		return nil, err
	}

	return content.Bytes(), nil
}
